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VulnerabilityPublished

CVE-2026-40587: blueprintue-self-hosted-edition · Insufficient Session Expiration

Affects blueprintue-self-hosted-editionSource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium : upgrade to 4.2.0 when convenient.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 15% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.2.0
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 21 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade blueprintue-self-hosted-edition and blueprintue/blueprintue-self-hosted-edition to 4.2.0.

Affected software

ProductAffectedFixed in
blueprintueblueprintue-self-hosted-editionAffected
  • <4.2.0
Fixed in
  • 4.2.0
GitHubblueprintue/blueprintue-self-hosted-editionpkg:github/blueprintue/blueprintue-self-hosted-editionOther threatsAffected
  • <4.2.0
Fixed in
  • 4.2.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade blueprintue-self-hosted-edition to version 4.2.0 or later, where this vulnerability is fixed by properly invalidating existing sessions upon password change or reset. Patch status is not explicitly stated but the fix is included in version 4.2.0. Until upgraded, users should be aware that password changes do not revoke active sessions.

Description

blueprintUE is a tool to help Unreal Engine developers. Prior to 4.2.0, when a user changes their password via the profile edit page, or when a password reset is completed via the reset link, neither operation invalidates existing authenticated sessions for that user. A server-side session store associates userID → session; the current password change/reset flow updates only the password column in the users table and does not destroy or mark invalid any active sessions. As a result, an attacker who has already compromised a session retains full access to the account indefinitely — even after the legitimate user has detected the intrusion and changed their password — until the session's natural expiry time (configured as SESSION_GC_MAXLIFETIME, defaulting to 86400 seconds / 24 hours, with SESSION_LIFETIME=0 meaning persistent until browser close or GC, whichever is later). This vulnerability is fixed in 4.2.0.

References

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